Update api-readall-test to use #to_api_hash

This allows me to sanity check the changes to the API JSON
from a loading perspective.

Related to: Homebrew/brew#16410

lib/hd-utils/stub-api/formula.rb

@@ -21,7 +21,7 @@ module Formula
  ::Formula.generating_hash!
  JSON = NAMES.to_h do |formula_name|
  formula = Formulary.factory(formula_name)
- json = JSON.generate(formula.to_hash_with_variations)
+ json = JSON.generate(formula.to_api_hash)
  hash = JSON.parse(json)
  [hash["name"], hash.except("name")]
  end.freeze